Low-Dose Radiation Therapy for Foot and Ankle Osteoarthritis
Foot and ankle osteoarthritis includes involvement of the talocrural joint, subtalar joint, midfoot, and MTP joints. Low-dose radiation therapy (LDRT) is an established option for this indication in European practice.
Evidence
Weissmann et al.: 196 patients; 84% showed clinically meaningful pain response at 3 months — the highest joint-specific response rate reported in the LDRT literature.
Hautmann et al.: 66 patients; median pain score 7 before treatment, 4 at 12-month follow-up. No significant difference between primary and post-traumatic OA (low-level retrospective finding).
The 2026 ARS Appropriate Use Criteria identifies foot and ankle OA as an appropriate indication after prior treatment failure. Distal joints involve minimal bone marrow irradiation and limited radiosensitive organ proximity.
01 - Inflamed midfoot - Reactive joint linings: The small joints across the middle of the foot can become reactive, and that local inflammation can amplify pain with every step.
02 - During treatment - Local signaling shifts: Small doses aim to change immune-cell and endothelial behavior, not destroy the joint.
03 - The weeks after - A quieter midfoot: The joint linings may become less reactive and send fewer pain signals over 4 to 12 weeks.
What changes: inflammatory behavior. What does not: bones, joint spacing, and bone spurs are not rebuilt.
Medically reviewed by:Robert Warren Floyd, M.D., Ph.D. — Resident Physician, Radiation Oncology, The University of Texas MD Anderson Cancer Center. Last reviewed: September 8, 2026. Independent personal project — not affiliated with or endorsed by MD Anderson Cancer Center. Funding & independence disclosure.
This content is for education only and is not medical advice. Always consult a qualified healthcare provider for diagnosis and treatment decisions.